Fire Fox add-ons help

What fire fox add-on's do you have. Why? What one is a must have in your option


I use
foxlingo- a translator

add n edit cookies- name says it

Adblock plus- I know it doesnt really stop you computer from getting the content but atleast you dont have to see it.

Multirow bookmarks toolbar- I kept saying why cant i have two rows then I found this now im happy

I everyone has to have addblock and multi row :D
I posted this because im thinking of getting a few more but i want some real thoughts
here are the ones im thinking about tell me if you use them or if you know better then what ive got or am thinking of getting


foxyproxy
flashgot
downthemall
infoRSS
betterprivacy